Parallel motion roll crusher



2 SHEETS-SHEET. 1

Dec. 25, 1951 o. R. STRAWN PARALLEL MOTION ROLL CRUSHER Filed Sept. 13, 1949 VE/Y TOE 5' -//v OEVAL RSTEAWN,

Bu hw gm Dec. 25, 1951 O STRAWN PARALLEL MOTION ROLL CRUSHER 2 SHEETS-SHEET 2 Filed Sept. 13, 1949 Patented Dec. 25, 1951 PARALLEL MOTION ROLL CRUSHER Orval R. Strawn, Columbus, Ohio, assignor to The Jeffrey Manufacturing Company, a corporation of Ohio Application September 13, 1949, Serial No. 1 15379 13 Claims. (01. 241--32) This invention relates to a crusher, preferably of the double roll type.

An object of the invention is to produce such a crusher in which overload release mechanism 'is provided and one of the crusher rolls so mounted that when released it is guided and restrained so that its axis of rotation moves parallel toward and from another rotor by simplified and effective means including a rockable cross shaft.

Another object of the invention is to provide a crusher preferably of the above mentioned type in which idler means is brought into operation to take up the slack in the drive means of the releasable rotor whenever said rotor is released.

A further object of the invention is to provide a crusher, preferably of the above mentioned type, in which means including a hydraulic or other jack is provided to restore the removable roll to its normal position after the safety means has released it and preparatory to re-establishing the safety holding means.

Other objects of the invention will appear hereinafter, the novel features and combinations being set forth in the appended claims.

In the accompanying drawings,

Fig. l is a side elevational view' of a double roll crusher incorporating the features of my invention;

Fig. 2 is a plan view of said crusher;

Fig. 3 is a sectional elevational view taken on the line 3--3 of Fig. 2, looking in the direction of the arrows;

Fig. 4 is an enlarged elevational view, with parts in section, taken on the line 4-4 of Fig. 2, looking in the direction of the arrows;

Fig. 5 is an enlarged view showing particularly the releasable support of the belt take-up of the releasable roll drive belt;

Fig. 6 is a sectional elevational View taken on the line 66 of Fig. 2, looking in the direction of the arrows;

Fig. 7 is a sectional elevational view showing the shear pin release mechanism and taken on the line 1-1 of Fig. 6, looking in the direction of the arrows;

Fig. 8 is a view similar to Fig. 7, taken at right angles thereto and on the line 8--8 of Fig. 6 of the drawings; and

Fig. 9 is a sectional view taken on the line 9-9 of Fig. 5 of the drawings.

As clearly illustrated, particularly in Figs. 1. 2 and 3 of the drawings, the double roll crusher which incorporates the features of my invention comprises a main frame III which includes a bottom bed plate ll having a central discharge opening [2 (see Fig. 3) through which reduced material is discharged from the housing or casing portion of said main frame which is formed of a plurality of welded plates including spaced side plates l3, l3, end plates I4 and i5 and removable top plates l6, l6, all of which cooperate to house a pair of rolls I! and [8 provided with removable segmental liners having integral teeth thereon.

The main frame housing provides a central feed opening 19 through which material, such as coal, may be fed to the reducing chamber provided by said main frame housing W, in which material is reduced between the oppositely rotating rolls H and I8 which rotate toward each other and size or reduce the material between them.

The roll I! is provided with a shaft 20 which is mounted near opposite ends in a pair of journal bearings carried in bearing boxes 2|, 2|. Bearing boxes 2 I, 2| are slidably mounted between upper guide rods 22, one adjacent each side of the .main frame and extending longitudinally thereof between end plates l4 and I5, and pairs of lower uide rods 23 which also extend between said end plates I4 and I5 and are supported upon box-like frame members, as clearly illustrated in Fig. 3 of the drawings.

The axis of rotation of the shaft 20 and roll I7 is adjustable in parallelism in a horizontal plane by threaded screw and nut adjusting mechanisms 24, there being one such mechanism associated with each of the bearing boxes 2|. Each adjusting mechanism is effective by rotating the threaded shaft thereof by ratchet devices 25 which are preferably interconnected by cross rod 26, thus insuring the uniform adjustment of the two bearing boxes 2| so as to adjust the roll i7 toward and from the roll [8.

One end of the shaft 20 is provided with a drive pulley 21 driven from an electric motor 28 through appropriate multiple V-belt drive mechanism 29. As suggested in Figs. 1 and 2 of the drawings, the motor 28 may be adjusted in position to maintain proper tension on the multiple belt drive mechanism 29.

The roll [8 is provided with a shaft 30 (see particularly Fig. 3) which is supported near opposite ends in appropriate journal bearings carried in bearmg boxes 3|, 32 and at one free end is provided with the drive pulley 33 of a multiple V -belt drive mechanism 34 driven from. an electric motor 35. The two bearing boxes 3| and 32 are mounted for sliding movement between the upper and lower guide rods 22 and 23, as

3 clearly illustrated in Fig. 3 of the drawings, which provides for movement of the axis of rotation of the roll I8, which is the axis of the shaft 30, in

parallelism towards and from the axis of rotation of the roll IT, in a horizontal plane.

The roll 18 is releasably held with its axis of rotation in a predetermined position by mechanism including overload shear pin release means so that in response to anoverload said roll It may move in a horizontal plane and in parallelism to the right, as viewed in Figs. 1 and 2 of the" drawings. To this end each of the bearing boxes 3| and 32 is provided with a rearwardly extending operating link, that for box' 32 being designated 36. As the structure of the two links and associated mechanism is similar, it will only be necessary to describe link 36'and its associated mechanism.

Said link 36 is pivoted at its forward' end to the bearing box 32 and at its rear end it is pivotally attached toa bifurcatedpivot'armt'l rigidly attachedja'sby welding, to one end of a cross or 7 in proper relation with the associated pulleys an automatic slack take-up mechanism is provided which is indicated generally by the reference character 55?. Said slack take-up mechanism includes an idler pulley 5| which preferably, though not necessarily, is normally held just above and out of contact with the asso- V mounted for limited rotation on a bracket 55 car- The cross shaft 38 is mounted for limited rotary or-swinging movement on a trans'versehorizontal axis relative to the mainframe In by means of three spaced bearings 48. 'It is thus evident that the rotoror roll I8 is mounted so that its axis of rotation is adjustable in a horizontal welded thereto whichis essentially of the same construction as bifurcated arms3'l and 39.

As clearly-illustrated in Figs. 6, '7' and 8 of the drawings, the end plate l5 carries a rearwardly extending'boss 42 which has a rectangular notch therein receiving a removable block 3 removably held in position by means including a set screw 44. The block 43 is adapted to receive a pair of hardened steel bushings45 removably held position by set screws 46 (see Fig. 7). Similar hardened bushings 4! are mounted in: the two branches of the pivot arm 4| and are removably held by set screws 48. r v

In the normal-position of the parts,as illustrated, for example, in Figs. 1,2 and 4 of thedrawings, the'bushings 45 and 41 will be inalign-ment and a shear pin 49 will extend-through and have close fit with aligned central bores in said bushings. Whenever an overload occurs the shear pin 49 will be sheared in two places adjacent the abutting ends of bushings 45 and 41 and permit the cross shaft- 38 to pivot, swing or rotate'a" limited amount, allowing the rotor or roll [-8 to move away from the roll llwhile the 'axis thereof It is obvious that when such overload-move-' ment of the roll or rotor I8 occurs, slack will be developed in the multiple V-driving belt of the drive mechanism 34. Tomaintain said belt ried by the end plate l5.

Stub shaft 54' extends to the right of the bracket 55, as viewed in Fig. 5 of the drawings, and is provided with a radially extending integral key-5twhichwhen the parts are in their normal positions rests on the top of a supporting headless screw 51 which is adjustably mounted on the free outer end of the link 35. The key iiyunde'r normal conditions'resting on the head 5?, will hold the arm 52 in position to maintaintheidler pulley 5f out of contact with the associated V-belts of the drive mechanism 34.

Whenever the overload shear pin dais-sheared, allowing the bearing box 32 tomove rearwardly, it is obvious that the screw 51 will move from under the'key 5'6, releasing the arm 52 sothat the idler 5! will fall by gravity and under theinfluence of the spring 53 to take up the slack in the driving belt for the pulley 33 and'l'oil or rotor I8, thus preventing damage thereto.

Wheneverthe shear mechanism 'is operated, together with the automatic slack take-up mechanism' 5%, it is, of course, necessary to provide a new shearpin 4'9 and to restore the parts to their normal positions of operation. To aid in this operation insofar as the automatic take-up mechanism 5% is concerned, saifd' mechanism includes a holding pawl lifise'eFig. 9-) which cooperates with the ledge of a boss 59 carried by the arm 52 to hold the arms: in its upper position temporarily while the link 3% extends rearwardly such an amount that s crew 5T is rearward of the key 56;; The pawl 58* is'pivotedto one arm of the bracket 55; It has a downwardly extending leg, asclearly illustrated in.

Fig. 9- of the drawings,- adapted to be contacted by an extension of a pivot pin 66 whichpivotally connects the 'above 'rnentioned link- 36 with the pivot arm 37!; so that'vvhen the link 36 is moved to itsnormal position and the headless screw 51 is beneath the key '56, the pawl 58 is released from theboss 59 so that con-trol of the pivot arm 52' will againberestored tothe link 3'5 under the control of-roll-l-8. V

Also to aid in restoring the partsto their normal positions for re-i-nsertiOnof a new shear pin- 45? is a jack preferably carried by the mainframe Ill. Irr-the form illustrated there is a jack 6! (see Fig's'. Z-a-nd 6') which under normal conditions is carried by appropriate bracket" means on the-plate l5, s'aid'j'ack, as illustrated, including'ja pum portion 62 which maybe operated;

bya handle, and a ram portion 63; the two parts being connected by a flexible hose since the complete'jack includes fundamentally a hand pump and connected rain or cylinder of a hydraulic a bracket connected-to the plate-l5 of the" 5. main frame In. The piston rod of said ram 63 has a cross shaft adapted to be received in U-bracket means 65 (Fig. 6) carried by one of the branches of the bifurcated pivot arm 4|.

It is thus evident that upon expansion of the ram 63, the rock shaft 38 may be rotated in a counter-clockwise direction, as viewed in Figs. 1, 4 and 6 of the drawings, thereby restoring the roll I8 to its normal position so that a new shear pin 49 may be inserted between the bushings 45,

41. It is, of course, evident that during this restoring operation the pivot arm 52 is held in elevated position by the pawl 58, which pawl is disengaged to restore the automatic character of the automatic slack take-up mechanism as soon as the roll 13 reaches its normal position.

In the operation of the device the two rolls or rotors Hand 18 will rotate in reversedirections, roll I! rotating clockwise and roll l8 rotating counter-clockwise, as viewed in Fig. 1 of the drawings. Should an overload occur, such as might be caused by a large piece of tramp metal or any unusually hard material, particularly of large size, such as might normally do damage to the machine, the shear pin 49 will be double sheared and allow the roll or rotor 18 to move in a horizontal plane and in parallelism away from the roll 11, the axis of the rotor [8 moving in parallelism at all times. This movement will be accompanied by rocking or limited rotation of the shaft 38 and the automatic release through the headless bolt and key 56 of the slack take-up mechanism 56 which will operate to take up the slack in the belt of the drive for the roll or rotor IS, with the idler 5| riding on the upper run of the belt of said drive. When such release has taken place the operator will shut down the crusher by stopping the motors 28 and 35 and re-establishing the normal conditions as above set forth, whereupon the unit will be ready to be placed in operation again.

Obviously those skilled in the art may make various changes in the details and arrangement of parts without departing from the spirit and scope of the invention as defined by the claims hereto appended, and applicant therefore wishes not to be restricted to the precise construction herein disclosed.

' Having thus described and shown anembodiment of the invention, what it is desired to secure by Letters Patent of the United States is:

1. A double roll crusher including a frame, a roll mounted on said frame for rotation on an axis, a second roll mounted on said frame for rotation parallel with the axis of said first roll, means mounting said second roll for parallel motion toward and from said first roll, said mounting means including slidable bearings supporting opposite ends of said, second roll, a rockable cross shaft, linkages including radial arms on said rock-able cross shaft interconnecting said bearings to opposite ends of said cross shaft, and shear pin means for releasably holding said rock shaft against rocking movement whereby said second roll is held in its operating crushing position.

2. A double roll crusher including a frame, a roll mounted on said frame for rotation on an axis, a second roll mounted on said frame for rotation on an axis parallel with the axis of said first roll, means mounting said second roll for parallel motion toward and from said first roll, said mounting means including slidable bearings supporting opposite ends of said second roll, a rockable cross shaft, linkages including radial roll for parallel motion toward and from said first roll, said mounting means including s-lidable bearings supporting opposite ends of said second, roll, means yieldingly normally holding the axis of rotation of said second roll in a predetermined position, driving means for said second roll including a flexible drive belt, and normally inoperative idler means operable responsive to lateral movement of said second roll from said axis of rotation in response to overload to take up the slack in said drive belt.

4. A crusher including a rotor, means cooperatingv with said rotor to crush material, means yieldingly normally holding said rotor for rotation on a fixed axis, driving means for said rotor including a flexible drive belt, and normally inoperative idler means operable responsive to lat eral movement of said rotor axis of rotation to take-up the slack in said drive belt.

5. A double roll crusher including a frame, a roll mounted on said frame for rotation on an axis, a second roll mounted on said frame for rotation on an axis parallel with the axis of said first roll, means mounting said second roll for l parallel motion toward and from said first roll,

said mounting means including slidable bearings supporting opposite ends of said second roll, a rockable cross shaft, linkages including radial arms on said rockable cross shaft interconnecting said bearings to opposite ends of said cross shaft, means for releasably holding said rock shaft against rocking movement whereby said second roll is held in its operating crushing position,

(and jack means carried by said frame for moving said second roll to its normal operating posi- 6. A crusher including a frame. a rotor mounted on said frame for normal rotation on a predetermined axis, means cooperating with said rotor to crush material, bearing means for opposite ends of said rotor, means yieldingly locking said bearing means against movement, said means including a rocking cross shaft, linkages including radially movable arms connecting said bearing means to said rocking cross shaft, and means releasably locking said shaft against rocking movement said releasable locking means being releasable when said rotor exerts excessive crushing pressure to release said bearings and rotor whereby the latter may move with respect to said cooperating crushing means.

'7. A crusher including a frame, a rotor mounted on said frame for normal rotation on a eate rotorzto itake up the slack in saidwbelt;zsaidrtakeel up 1 means; having.- a releasable; latch: normally;

holding it outzoficontact with said belt..

8;.A= crusher including a frame, a; rotor." mounted-on .said frame. for; normal rotation on a predetermined axis, means cooperating withisaid.

rotorrto lcrush material; bearing. meansv for opposite ends of said; rotor; meansyieldinglyalockingz said; bearing means. againstv movement,:. said; meansin'cluding a. rocking: cross-shaft, linkages including 1 radially; extending arms on said; rock-J ing' cross shaft connecting said bearing means to;

said, rocking cross, shaft, means releasably, looking .said-shaftiagainstrocking movement, means for drivinglsaid .1 rotor including a ,be1t,,.and. normally, inoperative taker-up means operable auto.-

maticall uponllateralmovement ;of theznormal axis; of rotation of. said rotor, to. take; up they slack-in Said, belt;

9.; A: crusherjincluding a frame-, arotor, shaft; means for said rotor mounted on said framefor normal rotation on,apredeterminedaxis, a-pulley on said shaft, bearing, meansior opposite ends; of said;shai'.t means, means yieldingly holding said, bearing means and shaft against; lateral movement, a; drive pulley, endless belt, means; interconnecting said pulleys, ,a normally; inoperativebelttake-up; means, and means responsive to lateral movement of; said shaftmeansfrom. its normalaxisof; rotation for causing saidnormally inoperativebelt take-up means, to engage,v said endless belt means; whereby the latter cannot;

be: thrown from said pulleys by reas0n;.0f; slac therein. 7 V

10. A, crusher including a frame a rotor, a,

pulley for driving said,rotor, bearingmeans;sup} porting said rotor and pulley on said frame for; normal rotationon apredeterminedaxis, means.

yieldingly holding'said rotor and said; pulleyv against lateralmovement, a drive pulley, end;

less belt means interconnecting said pulleys av normally inoperative belt take-up means, and

means responsive to lateral movement;v of said; rotor and pulley, from-their normalaxis ,of'rotae tion for causing said normally, inoperative belt take-up means to engage said endless belt means;

wherebvthe latter cannotube; thrown from said pulleys by, reason of slack therein. 7

, 1.1. A crusher including a frame, a rotq fi a pulley. for driving said rotor, shaft means for where y; th latt ann b hrown pm aii pulleys by, reason of, slaclrtherein.

12. A crusher including a frame, a ro tor, a, pulley, for driving; said; rotor, shaft means for,

Said pulley, bea nem a u pqr i i fih fi, and pulley onsaid frame for normalrotation ona predetermined axis, a drive pulley, endless eltm ans nt rconnec ing, i u eysfaglior mallydnoperative belttake-upmeans, and means re p n i e, to era m men of aid; 1 rfrorn itsnormalaxis ofrotation for causingsa d', normally inoperative belt take up means to en,-,

gage; said; endless; beltmeans whereby the lattercannot, be thrown from said; pulleys; byreason of slack therein. a V

13-. In combination, a frame, a shafta pulley, on said, s-hait, bearing means supporting said shaft andpulley on said fra mefor; normal'rota; tion on, a predetermined agris, a drive pulley,

endlessbelt means interconnecting saidpulleysp a. normally inoperativebelt take-up means, and

351 V l l c latter cannot be thrown from said pulleys by means responsive, to lateral movement, off-said pulley from its normal axis of rotation; for -caus ing said normally, inoperative belt take -up means.

to engage said endless belt means whereby reason of slack therein, V

o v n R. s 'raawn.

"RE ERENC S, orrnn The following references are of recordin,the.- file or this. pat n UNITED STATES PATENTS Number Name Date 243,052 'Zaepfel June 14, 18 84. 350,814 Coxe Oct. 12,- 1886 1,539,948 McGregor June 2, 1925 2,254,512 Brasington Sept. 2, 1941 2,414,591 Fowler Jan. 21, 1947, 

